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Question
a polynomial ax3+bx2+cx+d intersects x axis at 1,-1 and y axis at 2 then value of b is??
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Answer
f(1) = a+b+c+d = 0
f(-1) = -a + b -c +d = 0
Adding, we get, b+d = 0
f(0) = d = 2 => b = -2
